Email Servers Tools

Postmark is a transactional email delivery service that ensures your application's time-sensitive emails reach the inbox, not the spam folder.

A modern Django-based web UI for managing Mailman 3 mailing lists with REST API integration.

Free open-source webmail client with a modern, desktop-like user interface.

Schleuder is a GPG-encrypted mailing list manager for groups that need to communicate securely.

SendGrid is a cloud-based email delivery platform that handles transactional and marketing email at scale for developers and businesses.

Sendmail is a longstanding open-source mail transfer agent (MTA) for routing and delivering email on Unix-like systems.

Sendy is a self-hosted email newsletter application that uses Amazon SES to send emails at low cost.

Open-source email alias service that lets you create unique addresses to protect your real inbox from spam and trackers.

A modern, lightweight, self-hosted webmail client focused on speed and simplicity.

Open-source email spam filter with rule-based and Bayesian detection.

Professional email filtering and security platform designed for hosting providers.

A standards-based webmail application written in PHP for IMAP servers.

An open-source mail server with JMAP, IMAP, SMTP, and built-in spam filtering, written in Rust for performance and security.

Sympa is an open source mailing list manager that powers email-based group communication with web-based administration.

WildDuck is a modern, scalable mail transfer agent and IMAP server built on Node.js and MongoDB.